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TECHNICAL LIBRARY

Q: I often use the temporary reference point,
but I would like to see both absolute coordinates and relative coordinates,
without toggling the reference point on and off.

A: The menu command Measure>> Coordinate
Axes toggles the display of the coordinate axes. They are shown
along the upper and left borders of the layout window. The current
cursor position is shown by running marks on these axes. Therefore
if you switch the axes on and set a reference point, you may see
the relative cursor position at the Metric bar, as well as the absolute
cursor position at the coordinate axes, see Figure 1. Cursor cross-hairs
may be helpful in this case as well.

Figure 1.

Q: Can I perform a check
for polygons touching by corners using your Savage DRC system?
(See Figure 2.)

A: The required check
looks somewhat complex:

(* CHECKS FOR CORNER TOUCHING
ERRORS *)

(* NOTE: merge the IN layer
only if it is not already merged *)

Merge:

Layer = IN,
LayerR = &IN_Merged(1);

OutDistance:

Layer = &IN_Merged,
Type = LE,
Value = 0.00um;

Width:

Layer = &IN_Merged,
Type = LE,
Value = 0.00um;

The reason is that there
is some discrepancy in merging operation. In Expert
two touching boxes are never merged into one figure. In Savage
they are sometimes merged into an 8-shaped polygon, so you need
to check both for zero outdistance and for zero width. This discrepancy
will be fixed in one of the subsequent releases of Savage system.

A: When DRC Guard
performs checks, it is supposed to use 100% of processor time. When
DRC Guard enabled but idle, you can still notice that processor
is about 100% busy. This happens because the error mark drawing
function of DRC Guard runs in background.

Even if there are no errors,
this function can load the processor to 100%. But this is not to
be worried about. This cycle works only when Expert
and other WinNT applications are idle. When you start using Expert,
DRC Guard drawing is stopped and Expert performance
is not affected. Moreover, this drawing is stopped when some other
application is activated, so the performance of WinNT and other
applications are not affected.